Medium [CVE-2026-63930] fix use-after-free in error path

In the Linux kernel, the following vulnerability has been resolved: iio: buffer: hw-consumer: fix use-after-free in error path In the err_put_buffers cleanup path of iio_hw_consumer_alloc(), the code was using list_for_each_entry() to iterate through buffers while calling iio_buffer_put() which can free the current buffer if refcount drops to 0.

The list_for_each_entry() loop macro then evaluates buf->head.next to continue iteration, accessing the freed buffer. Fix this by using list_for_each_entry_safe().

During buffer cleanup, the code incorrectly uses `list_for_each_entry()` to iterate through buffers while simultaneously freeing them, which can lead to accessing memory that has already been released. This memory corruption could result in a denial of service or potentially lead to arbitrary code execution.

Red Hat severity: Moderate. Weakness: CWE-825.

Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.